If it's a desert, the replicator; If it's a jungle or forested area, the subspace radio. I could survive in a wooded area on earth, I may get lucky on an alien world and the chance for rescue would be greatest with the radio.

Would you rather revert back to a kid after death like in "Star Trek III: The Search for Spock" or be turned to a kid during your lifetime like in TNG's "Rascals"?